When I went through the Dana 60 for my Chevy, the kingpin rebuild was a breeze! My gosh! Nothing could be easier. The only thing that might be difficult to R&R would be the actual kingpin which requires some serious torque and a special large hex to remove and reinstall. Not a big deal if you have friends who work on semis all day (and have serious torque wrenches and impacts), which I do since I'm a truck driver. But the steel kingpins on a Dana 60 aren't subject to any significant wear under normal conditions (mine were perfect). The nylon bushing and spring are all you really need to do under most circumstances, if you do anything at all, which is rare on a light-duty truck (pickup). Even the bushings and springs weren't noticably worn, but I had bought the kit and did them anyway.
Balljoints are nowhere near as durable or strong as kingpins. Not even close. Look under any truly heavy-duty truck (semi, dump truck, etc. ). You will find kingpins, not balljoints.
The balljoints that DC spec'd on our Dodge Dana 60's are the cost-saving, cheapass equivilent of the unitized hubs and bearings. They plain suck for everyone but DC penny counters and replacement parts dealers.
I'm ashamed of Dana-Spicer for even agreeing to cheapen and weaken the famous Dana 60 front axle to such a degree. They hurt their own reputation greatly by doing so IMO.